The original patch uses a feature in lib/vsprintf.c to handle the invalid address when tring to print *_fw_module->man4_module_entry.name when the *rc_fw_module is NULL. This case is handled by check_pointer_msg() internally and turns the invalid pointer to '(efault)' for printing but it is hiding useful information about the circumstances. Change the print to emmit the name of the widget and a note on which side's fw_module is missing.

Fixes: e3720f92e023 ("ASoC: SOF: avoid a NULL dereference with unsupported widgets") Reported-by: Dan Carpenter error27@gmail.com Link: https://lore.kernel.org/alsa-devel/4826f662-42f0-4a82-ba32-8bf5f8a03256@kili... Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com --- Hi Mark, Dan,

This patch clarifies the print and will not rely on vsprintf internal protection on printing the error.

Regards, Peter

sound/soc/sof/ipc4-topology.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c index 669b99a4f76e..3a5394c3dd83 100644 --- a/sound/soc/sof/ipc4-topology.c +++ b/sound/soc/sof/ipc4-topology.c @@ -1806,10 +1806,12 @@ static int sof_ipc4_route_setup(struct snd_sof_dev *sdev, struct snd_sof_route * int ret;

if (!src_fw_module || !sink_fw_module) { - /* The NULL module will print as "(efault)" */ - dev_err(sdev->dev, "source %s or sink %s widget weren't set up properly\n", - src_fw_module->man4_module_entry.name, - sink_fw_module->man4_module_entry.name); + dev_err(sdev->dev, + "cannot bind %s -> %s, no firmware module for: %s%s\n", + src_widget->widget->name, sink_widget->widget->name, + src_fw_module ? "" : " source", + sink_fw_module ? "" : " sink"); + return -ENODEV; }